For angle abc
, find the measure of angle ACD.
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∠ ACD = 66° + 45°
∠ ACD = 111°
another method:
∠A +∠B + ∠ACB = 180° ( sum of angles of triangle is 180° )
∠ACB = 180 - 111
∠ACB = 69°
∠ACB + ∠ ACD = 180 ( straight angle )
69 + ∠ ACD = 180
∠ ACD = 180 - 69
∠ ACD = 111°
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hope it helps :^)
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